Rear Defogger performance

[solman]

I have the type A with tech and I believe the rear defogger is slow to clear the window. While the mirrors clear fast the back glass seems to take a solid 15 minuets to clear. Are others finding about the same time frame or is mine not up to spec?

 

[JC-RH]

My rear window had a lot of condensation tonight. Between 10-15 minutes on my way to my destination and then again on the way back, and absolutely no effect after pressing the button to clear the window.

 

[RRP RSX-S]

You guys have tint? Some lesser quality places cut the connectors so the defrosters don’t work anymore.

 

[solman]

No tint added for me

 

[JC-RH]

I just checked, and all lines are intact. My tint guy is super reputable, and all his pieces are precut by a machine. If I remember correctly, he just heats it up while on the outside to get it to curve correctly prior to final installation.

I still need to check the 30A fuse under the hood.

I didn’t see any actual connection points around the window. I’m guessing I’ll have to remove the window trim pieces to gain access and take a measurement with my multimeter.

 

[submitaweasel]

The rear defrost seems to not work well with fogged windows. I can confirm both this, and after our first snow last night, that it works just fine for snow/ice. There is likely a thermal switch regulating temperature of the heater itself opposed to just applying a steady current. This wouldn't surprise me at all being a resistance heater and the abundance of microcontroller options there are in the industrial environment. I obviously can't confirm this without probing the wiring which I'm not going to do while my car is under warranty.

Last vehicle I had there was a recall for the rear defrost melting the wiring harness. It worked super quick though!

I have also noticed that the car's windows in general seem to like to fog. I read online that some of the materials used in manufacturing of the interior pieces can cause this and diminish over time.

 

[JC-RH]

I found the under hood fuse, but it’s different than the traditional ones. I didn’t mess with it.

Instead I grabbed my multimeter and took a measurement of the rear window. It read 12V in a few different places.

I guess it’s what submitaweasel said…it’s not the best at defogging. I’ll test it out under different conditions.

 

[goosala]

Mine is slow to work as well.

 

[Integra23]

I just use the rear defrost for the mirrors which seem to heat up quickly. Never use the rear window since I'm always passing people. I only care what's in front of or beside me.

 

[SKL]

Mine didn't work great when I first got the car and it fogged up even when I'm alone.
But after a couple of cleanings, it's been working great. No issues here.